#!/bin/env python
class Fib(object):
	def __getitem__(self,n):
		if isinstance(n,int):
			a,b=1,1
			for x in range(n):
				a,b = b, a + b
			return a
		if isinstance(n,slice):
			start = n.start
			stop = n.stop
			if start is None:
				start = 0
			a,b=1,1
			L = []
			for x in range(stop):
				if x >= start:
					L.append(a)
				a,b=b,a+b
			return L
if __name__=='__main__':
	f = Fib()
	print f[0:5]
	print f[:10]
